Slip rotation for rock drills



Dec. 26, 1933. PEARSON 1,940,693

SLIP ROTATION FOR ROCK DRILLS Filed June 22, 1928 2 Sheets-Sheet l Dec. 26, 1933. G, c. PEARSON 1,940,693

SLIP ROTATION FOR ROCK DRILLS Fi'led June 22, 1928 2 Sheets-Sheet 2 abbot/tug Patented Dec. 26, 1933 1,940,693. SLIP ROTATION FOR noon DRILLS Gustavfi. Pearson, Denver, Colo, assignor to Gardner-Denver Company, Denver, 0010., a Y corporation of Delaware AppIicationJune-ZZ; 1928. Serial 287,554

120laimsr (01.121-7) The object oi the. present invention is. to provide novel means of. an effective character and under thevcontro'l. oi the operator for-holding the rifle bar ratchet mechanism eta-rock. drill nor: & mally-in operative conditiom but permitting it. to slip under abnormal conditions-so as. to prevent. the. cylinder member being rotated, as for instance whentthe, steel. becomes stuck. andheld against rotation.

lo the. accompanying drawings;

Figure. l is a view. in. levationoi a. portion of a rock drill equippedwith the novel mechanism Figure 2; is a longitudinal sectional view on. the line.- 2'.-2 oi Figural. l 15 Eigure. 3-isa crosssectihnal viewon the line 3-3 or Figure 2,. V

Figure 4 is ardetail perspective view oi the con.- tro-lling, handle, i

In the embodiment, disclosedga cylinder mem 2[) her 5is,employedhavingachamber 6-,, in which is a reciprocatory piston l thatdscapa'ble of rotary movement. This piston asusuaL. has. an interfitting sliding engagement, with the chuck. oi a tool holder for the purpose oi, rotating the latter 25, and thereby the: steel or: toolengagedstherein'. The rotary movementloi the piston. iseftected means: ot a rifle. bar 8. slidably engaged ma nut. a: fixed the rear end. of the. pistoni This rifle bar has at.- i'ts. rear. end av ratchet. head ll]. 34 provided with pivoted outwardly spring. pressed pawls Ll-U These, pawls. engage the internal teeth-:12: of a ratchetlring; 13. rotatably. mounted a. chamber liiormed in the. rear end of. the cylinder member. If the ratchet ring 13 is free to rotate the. piston 7: will notbe rotatembut. if the ring 13, is. held aga nst rotation, then the piston is-givenastep-by-step rotation.

Surrounding the. ratchet. ring 13. is a. clutch band or ring L5 having, asuitable. friction. clutch liningz 16.- that engages the periphery of the ratchet ring l=3-.. One end of the. clutch band. 15

isanchored-by: apin 17 secured thereto and engagedi a socket 1.8 in. the. cylinder member. The other. end. of the. band terminates 'in a; bolt 19- that is externally threadedand. is located. in a-tangential socket 211. formed in. an enlargement 21. on. one side of the cylinder. member.

Fixed tothe. cylindermember is a .Ushaped tool holding handle. 22' having. anofiset longitudinallydisposed handle grip 23; This. handle hasadjacent to itsmounti'ng 24.. a bearing. portion 25,: on which. is journaled the eye 2.6 or a clutch controlling handle. This handle consists of an; L.-shaped shank. 27 terminating in. a. grip 28 that overlies-the. grip; 23 and. hasathumb' piece one endv of the eye.

projection 29'. The handle eye 26' is urged againstthe mounting 24' by a coiled spring 30 mounted on the main handle and bearing against This spring is housed. Within a. shield cup 31 also carried by the main. handie and. abutting against ashoulder '32.. formed "thereon. The handle 26 is provided with an offset lug or arm. 33 provided withan opening 34, through. which .passes' a rotatable stem 35.

' This stemlhas a. socket. 36, the. walls of which are 5 externally threaded and are screwed uponthe bolt. 19 of they clutch band. The stem.3.5 terminates at its outer end in a head 37', by' which. it can. be. rotated and is. also provided with a cross pin. 38 adapted to engage in seats 39 formed in 7.0 the armor" the lug. 33.. .Bearing against the inner side of the lug. or arm 33 i's'a coiled spring 40"surrounding the stem, 35 and located in a socket 41 formed in the enlargement 21'. With. this construction, it will. be evident that '25 the spring 40 pressing the'arm or lug 33. outwardly,v will cause-the lining of the friction band 7 15. to frictionally bear againstv the periphery of the ratchet ring. 13'. The amount of. tensi'on upon the band by the, sprin'gAO can be varied so. by turning the stem 35 so as'to thread the bolt -19 more or less into the same. This stemis howband 15 to hold the ratchet, ring 13 against r0 tation in the cylinder member. The piston 7 is. therefore during itsreciprQ'catiOn given a step by-step rotation in a mannerwell' understood. Should the. handle fly out, of the hand of the operator as may be the case when the steel becomes stuck, the frictional action. of theclutch band 15 is greatly reduced andthe danger of the 95. tool rotating. on the piston and striking the operator is minimized. More thanthat, should the operator desireto manually turn the entire tool for the purpose of turning the. drillsteel, when itbecomes stuck, he has only to grip the handles 23- and 28 tightly togethenf-whereupon he moresecurely holds the clutchri'ng 13 so that the entire tool. can be. turned to turn the steel. The grip28 it will be noted is directly adjacent to the terminal hand grip 23. of the main holding handle and. consequently the fingers of the operators hand, grasping. the hand grip 23 can also-freely operate on the grip 28, which thus constitutes.- a. fingerpiece. The opposite. thumb piece 29: on. the. other hand is. so. located that 11 changes in the size, shape, proportion and minor details of construction may be resorted to without departing from the spirit'or sacrificing any of the advantages of the invention.

What I claim, is: 1. The combination with a cylinder member and a reciprocatory piston therein, of means for effecting the rotation of the piston including a rifle bar having a ratchet head, a ratchet ring with which the head cooperates said ring being rotatably mounted in the cylinder member, a

friction clutch band that engages the ring to hold it from rotating, a handle for holding the cylinder member, and a second handle pivotally mounted on the first handle and connected to the band for clamping it against the ring.

2. The combination with a cylinder member and a reciprocatory piston therein, of means for effecting the rotation of the piston including a rifle bar having a ratchet "head, a ratchet ring with which the head cooperates, said ring being rotatably mounted in the cylinder member, a

clutchring anchored in the cylinder member and engaging the ratchet ring, a handle for holding the cylinder memben'a clutch handle having a pivotal mounting on the holding handle, a

7 spring operating on the clutch handle to cause it to tighten the clutch ring on the ratchet ring, and an extensible connection between the clutch handle and clutch ring. 7 v

3. The combination with cylinder member and a reciprocatorypiston therein, of means for effectinglthe rotation of; the piston including a rifle bar having a ratchet head, a ratchet ring with which the head cooperates, said ring being rotatably mounted in the cylinder member, a'

clutch ring anchored in the cylinder member a and engaging the ratchet ring; a handle for holding the cylinder member; a clutch handle having a pivotal mounting on the holding handle, a spring operating on the clutch handle to cause it to tighten the clutch ring on the ratchet ring, and a stem rotatably mounted in the clutch handle and having a threaded engagement with the clutch ring. V

4. The combination with a cylinder member and .a reciprocatory piston therein, of means for efiecting the rotation of the piston including a rifle. bar having a ratchet head, a ratchet ring with which the head cooperates, said ring being rotatably mounted, in the cylinder member, a clutch ring encircling the ratchet ring and frictionally engaging the same, an anchor for one end of the clutch ring, a threaded bolt on the other end, a handle for holding the cylinder member a handle having a pivotal mounting on the holding handle, a stem rotatably mounted in the second handle and having a threaded engagement with the bolt, and a coiled spring bearing against the second handle.

5. The combination with a cylinder member and a reciprocatory piston therein, of ratchet mechanism for rotating the piston including a rotatable ratchet ring, a handle for "holding the cylinder, and means for holding the ratchet ring against rotation including a device engaging the ring and a movable supplemental handle having a connection with the device for operating it and having a finger grip and an offset thumb piece for respectively moving said handle in opposite directions by a hand grasping the holding handle.

'6. The combination with a cylinder member and a reciprocatory piston therein, of ratchet mechanism for rotating the piston including a rotatable ratchet ring, a handle for holding the cylinder having a terminal hand grip, and means for holding the ratchet ring against rotation, including a'device engaging the ring and a movable handle having a connection with the device for operating it and having a finger piece that lies alongside the holding handle and adjacent to the grip for engagement by the fingers of a hand that grasps said grip to move the movable handle in one direction, said movable handle having an offsetthumb piece also adjacent to the grip and adapted to be pressed against by the thumb to move the movable handle in the opposite direction.

7. The combination with a cylinder member and a reciprocatory piston therein, of ratchet mechanism for rotating the piston including a rotatable ratchet ring, a handle for holding the cylinder having a terminal hand grip, and means for holding the ratchet ring against rotation,

including a friction contractile clutch ring that engages the ratchet ring, and a movable handle having a connection with the clutch ring for moving it, said movable handle having a finger piece that lies alongside the holding handle and adjacent to the grip for engagement by the fingers of a hand that grasps said grip to move the movable handle in one direction, said movable handle having an offset thumb piece also adjacent to the grip and adapted to be pressed against by the thumb to move the movable handle in the opposite direction.

8. The combination with a cylinder member .and a reciprocatory piston therein, of means for effecting the rotation of the piston including a rifle bar having a ratchet head, a ratchet ring with which the head co-operates, said ring being rotatably mounted in the cylinder member, a friction clutch band movably engaging'the ring to hold it from rotating, a handle for holding the cylinder member, and a second handle movably mounted on the first handle andadjustably connected to the band for controlling its clamping action against the ring.

,9. The combination with a cylinder member and a reciprocatory piston therein, of means for effecting the rotation of the piston including a rifle bar having a ratchet head, a ratchet ring with which the head co-operates, said ring being rotatably mounted in the cylinder member, a clutch band surroundingfand frictionally engaging the ratchet ring, a holding handle for the cylinder member, a clutch operating handle pivotally mounted on the cylinder member and disposed adjacent the holding handle, and an adjustableconnection between the band and the clutch operating handle to regulate the frictional engagement of the band upon the ring.

10. The combination with a cylinder member and a reciprocatory piston therein, of means for effecting the rotation of the piston including a rifle bar having a ratchet head, a ratchet ring its with which the head co-operates, said ring being 7 engaging the ratchet ring,a holding handle for mechanism for rotating thatpiston, including a rotatable ratchet ring, a handle for holding the cylinder, means for holding the ratchet ring against rotation, including a movable supplemental handle that is adjacent to the holding handle and operated by a hand grasping the holding handle, and a band encircling the ratchet ring and having means for varying its clamping action thereupon, and said means being engageable by the supplemental'handle for increasing the clamping action of the band upon" the ring above that controlled by the means.

12. The combination with a cylinder member and a reciprocatory piston'therein, of ratchet mechanism for rotating the piston, including a rotatable ratchet ring, a holding handle for the cylinder, a supplemental handle movably mounted upon the cylinder, an element engageable with the ratchet ring to hold it against rotation and having means for varying its engage ment therewith, and said means being movable upon the movement of the supplemental handle for increasing the engagement of the element with the ring above that controlled by the means.

V GUSTAV C. PEARSON. 

